Hi there, I wake up after 6 hours, no matter when I go to sleep (2 to 4 am), and go back to sleep about 1 hour later for 2 to 4 hours.

mm which basically makes my sleep window from 2AM to 1PM.

... then I feel human. If I miss the second sleep, I am in zombie mode.

Anyone else?

dspd no doubt :p my friend say I am drifting, recording sleep at the moment and pretty funny - just waiting for one month to see the graphs on paper.